Soybean cultivar 9431836328642

ABSTRACT

A novel soybean cultivar, designated 9431836328642, is disclosed. The invention relates to the seeds of soybean cultivar 9431836328642, to the plants of soybean 9431836328642 and to methods for producing a soybean plant produced by crossing the cultivar 9431836328642 with itself or another soybean variety. The invention further relates to hybrid soybean seeds and plants produced by crossing the cultivar 9431836328642 with another soybean cultivar.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinctive soybean cultivar, designated 9431836328642. There are numerous steps in the development of any novel, desirable plant germplasm. Plant breeding begins with the analysis and definition of problems and weaknesses of the current germplasm, the establishment of program goals, and the definition of specific breeding objectives. The next step is selection of germplasm that possess the traits to meet the program goals. The goal is to combine in a single variety an improved combination of desirable traits from the parental germplasm. These important traits may include higher seed yield, resistance to diseases and insects, better stems and roots, tolerance to drought and heat, and better agronomic quality.

Choice of breeding or selection methods depends on the mode of plant reproduction, the heritability of the trait(s) being improved, and the type of cultivar used commercially (e.g., F₁ hybrid cultivar, pureline cultivar, etc.). For highly heritable traits, a choice of superior individual plants evaluated at a single location will be effective, whereas for traits with low heritability, selection should be based on mean values obtained from replicated evaluations of families of related plants. Popular selection methods commonly include pedigree selection, modified pedigree selection, mass selection, and recurrent selection.

The complexity of inheritance influences choice of the breeding method. Backcross breeding is used to transfer one or a few favorable genes for a highly heritable trait into a desirable cultivar. This approach has been used extensively for breeding disease-resistant cultivars. Various recurrent selection techniques are used to improve quantitatively inherited traits controlled by numerous genes. The use of recurrent selection in self-pollinating crops depends on the ease of pollination, the frequency of successful hybrids from each pollination, and the number of hybrid offspring from each successful cross.

Each breeding program should include a periodic, objective evaluation of the efficiency of the breeding procedure. Evaluation criteria vary depending on the goal and objectives, but should include gain from selection per year based on comparisons to an appropriate standard, overall value of the advanced breeding lines, and number of successful cultivars produced per unit of input (e.g., per year, per dollar expended, etc.).

Promising advanced breeding lines are thoroughly tested and compared to appropriate standards in environments representative of the commercial target area(s) for three or more years. The best lines are candidates for new commercial cultivars; those still deficient in a few traits may be used as parents to produce new populations for further selection.

These processes, which lead to the final step of marketing and distribution, usually take from eight to 12 years from the time the first cross is made. Therefore, development of new cultivars is a time-consuming process that requires precise forward planning, efficient use of resources, and a minimum of changes in direction.

A most difficult task is the identification of individuals that are genetically superior, because for most traits the true genotypic value is masked by other confounding plant traits or environmental factors. One method of identifying a superior plant is to observe its performance relative to other experimental plants and to a widely grown standard cultivar. If a single observation is inconclusive, replicated observations provide a better estimate of its genetic worth.

The goal of plant breeding is to develop new, unique and superior soybean cultivars and hybrids. The breeder initially selects and crosses two or more parental lines, followed by repeated selfing and selection, producing many new genetic combinations. The breeder can theoretically generate billions of different genetic combinations via crossing, selfing and mutations. The breeder has no direct control at the cellular level. Therefore, two breeders will never develop the same line, or even very similar lines, having the same soybean traits.

Each year, the plant breeder selects the germplasm to advance to the next generation. This germplasm is grown under unique and different geographical, climatic and soil conditions, and further selections are then made, during and at the end of the growing season. The cultivars which are developed are unpredictable. This unpredictability is because the breeder's selection occurs in unique environments, with no control at the DNA level (using conventional breeding procedures), and with millions of different possible genetic combinations being generated. A breeder of ordinary skill in the art cannot predict the final resulting lines he develops, except possibly in a very gross and general fashion. The same breeder cannot produce the same cultivar twice by using the exact same original parents and the same selection techniques. This unpredictability results in the expenditure of large amounts of research monies to develop superior new soybean cultivars.

The development of new soybean cultivars requires the development and selection of soybean varieties, the crossing of these varieties and selection of superior hybrid crosses. The hybrid seed is produced by manual crosses between selected male-fertile parents or by using male sterility systems. These hybrids are selected for certain single gene traits such as pod color, flower color, pubescence color or herbicide resistance which indicate that the seed is truly a hybrid. Additional data on parental lines, as well as the phenotype of the hybrid, influence the breeder's decision whether to continue with the specific hybrid cross.

Pedigree breeding and recurrent selection breeding methods are used to develop cultivars from breeding populations. Breeding programs combine desirable traits from two or more cultivars or various broad-based sources into breeding pools from which cultivars are developed by selfing and selection of desired phenotypes. The new cultivars are evaluated to determine which have commercial potential.

Pedigree breeding is used commonly for the improvement of self-pollinating crops. Two parents which possess favorable, complementary traits are crossed to produce an F₁. An F₂ population is produced by selfing one or several F₁'s. Selection of the best individuals may begin in the F₂ population; then, beginning in the F₃, the best individuals in the best families are selected. Replicated testing of families can begin in the F₄ generation to improve the effectiveness of selection for traits with low heritability. At an advanced stage of inbreeding (i.e., F₆ and F₇), the best lines or mixtures of phenotypically similar lines are tested for potential release as new cultivars.

Mass and recurrent selections can be used to improve populations of either self- or cross-pollinating crops. A genetically variable population of heterozygous individuals is either identified or created by intercrossing several different parents. The best plants are selected based on individual superiority, outstanding progeny, or excellent combining ability. The selected plants are intercrossed to produce a new population in which further cycles of selection are continued.

Backcross breeding has been used to transfer genes for a simply inherited, highly heritable trait into a desirable homozygous cultivar or inbred line which is the recurrent parent. The source of the trait to be transferred is called the donor parent. The resulting plant is expected to have the attributes of the recurrent parent (e.g., cultivar) and the desirable trait transferred from the donor parent. After the initial cross, individuals possessing the phenotype of the donor parent are selected and repeatedly crossed (backcrossed) to the recurrent parent. The resulting plant is expected to have the attributes of the recurrent parent (e.g., cultivar) and the desirable trait transferred from the donor parent.

The single-seed descent procedure in the strict sense refers to planting a segregating population, harvesting a sample of one seed per plant, and using the one-seed sample to plant the next generation. When the population has been advanced from the F₂ to the desired level of inbreeding, the plants from which lines are derived will each trace to different F₂ individuals. The number of plants in a population declines each generation due to failure of some seeds to germinate or some plants to produce at least one seed. As a result, not all of the F₂ plants originally sampled in the population will be represented by a progeny when generation advance is completed.

In a multiple-seed procedure, soybean breeders commonly harvest one or more pods from each plant in a population and thresh them together to form a bulk. Part of the bulk is used to plant the next generation and part is put in reserve. The procedure has been referred to as modified single-seed descent or the pod-bulk technique.

The multiple-seed procedure has been used to save labor at harvest. It is considerably faster to thresh pods with a machine than to remove one seed from each by hand for the single-seed procedure. The multiple-seed procedure also makes it possible to plant the same number of seeds of a population each generation of inbreeding. Enough seeds are harvested to make up for those plants that did not germinate or produce seed.

Descriptions of other breeding methods that are commonly used for different traits and crops can be found in one of several reference books (e.g., Allard, 1960; Simmonds, 1979; Sneep et al., 1979; Fehr, 1987).

Proper testing should detect any major faults and establish the level of superiority or improvement over current cultivars. In addition to showing superior performance, there must be a demand for a new cultivar that is compatible with industry standards or which creates a new market. The introduction of a new cultivar will incur additional costs to the seed producer, the grower, processor and consumer; for special advertising and marketing, altered seed and commercial production practices, and new product utilization. The testing preceding release of a new cultivar should take into consideration research and development costs as well as technical superiority of the final cultivar. For seed-propagated cultivars, it must be feasible to produce seed easily and economically.

Soybean, Glycine max (L), is an important and valuable field crop. Thus, a continuing goal of plant breeders is to develop stable, high yielding soybean cultivars that are agronomically sound. The reasons for this goal are obviously to maximize the amount of grain produced on the land used and to supply food for both animals and humans. To accomplish this goal, the soybean breeder must select and develop soybean plants that have the traits that result in superior cultivars.

SUMMARY OF THE INVENTION

According to the invention, there is provided a novel soybean cultivar, designated 9431836328642. This invention thus relates to the seeds of soybean cultivar 9431836328642, to the plants of soybean 9431836328642 and to methods for producing a soybean plant produced by crossing the soybean 9431836328642 with itself or another soybean line.

Thus, any such methods using the soybean variety 9431836328642 are part of this invention: selfing, backcrosses, hybrid production, crosses to populations, and the like. All plants produced using soybean variety 9431836328642 as a parent are within the scope of this invention. Advantageously, the soybean variety could be used in crosses with other, different, soybean plants to produce first generation (F.) soybean hybrid seeds and plants with superior characteristics.

In another aspect, the present invention provides for single gene converted plants of 9431836328642. The single transferred gene may preferably be a dominant or recessive allele. Preferably, the single transferred gene will confer such traits as herbicide resistance, insect resistance, resistance for bacterial, fungal, or viral disease, male fertility, male sterility, enhanced nutritional quality, and industrial usage. The single gene may be a naturally occurring soybean gene or a transgene introduced through genetic engineering techniques.

In another aspect, the present invention provides regenerable cells for use in tissue culture of soybean plant 9431836328642. The tissue culture will preferably be capable of regenerating plants having the physiological and morphological characteristics of the foregoing soybean plant, and of regenerating plants having substantially the same genotype as the foregoing soybean plant. Preferably, the regenerable cells in such tissue cultures will be embryos, protoplasts, meristematic cells, callus, pollen, leaves, anthers, roots, root tips, flowers, seeds, pods or stems. Still further, the present invention provides soybean plants regenerated from the tissue cultures of the invention.

DEFINITIONS

In the description and tables which follow, a number of terms are used. In order to provide a clear and consistent understanding of the specification and claims, including the scope to be given such terms, the following definitions are provided:

Maturity Date. Plants are considered mature when 95% of the pods have reached their mature color. The number of days are either calculated from September 1 or from the planting date.

Seed Yield (Bushels/Acre). The yield in bushels/acre is the actual yield of the grain at harvest.

Lodging Resistance. Lodging is rated on a scale of 1 to 5. A score of 1 indicates erect plants. A score of 2.5 indicates plants are leaning at a 45° angle in relation to the ground and a score of 5 indicates plants are laying on the ground.

Phytophthora Tolerance. Tolerance to Phytophthora root rot is rated on a scale of 1 to 5, with a score of 1 being the best or highest tolerance ranging down to a score of 5 which indicates the plants have no tolerance to Phytophthora.

Emergence. This score indicates the ability of the seed to emerge when planted 3″ deep in sand and with a controlled temperature of 25° C. The number of plants that emerge each day are counted. Based on this data, each genotype is given a 1 to 5 score based on its rate of emergence and percent of emergence. A score of 1 indicates an excellent rate and percent of emergence, an intermediate score of 2.5 indicates average ratings and a 5 score indicates a very poor rate and percent of emergence.

Iron-Deficiency Chlorosis. Plants are scored I to 5 based on visual observations. A score of 1 means no stunting of the plants or yellowing of the leaves and a score of 5 indicates the plants are dead or dying caused by iron-deficiency chlorosis, a score of 2.5 means plants have intermediate health with some leaf yellowing.

Brown Stem Rot. This is a visual disease score from 1 to 5 comparing all genotypes in a given test. The score is based on leaf symptoms of yellowing and necrosis caused by brown stem rot. A score of 1 indicates no symptoms. Visual scores range to a score of 5 which indicates severe symptoms of leaf yellowing and necrosis.

Shattering. The amount of pod dehiscence prior to harvest. Pod dehiscence involves seeds falling from the pods to the soil. This is a visual score from 1 to 5 comparing all genotypes within a given test. A score of 1 means pods have not opened and no seeds have fallen out. A score of 2.5 indicates approximately 50% of the pods have opened, with seeds falling to the ground and a score of 5 indicates 100% of the pods are opened.

Plant Height. Plant height is taken from the top of soil to top node of the plant and is measured in inches.

Seed Protein Peroxidase Activity. Seed protein peroxidase activity is defined as a chemical taxonomic technique to separate cultivars based on the presence or absence of the peroxidase enzyme in the seed coat. There are two types of soybean cultivars, those having high peroxidase activity (dark red color) and those having low peroxidase activity (no color).

Allele. Allele is any of one or more alternative forms of a gene, all of which alleles relate to one trait or characteristic. In a diploid cell or organism, the two alleles of a given gene occupy corresponding loci on a pair of homologous chromosomes.

Backcrossing. Backcrossing is a process in which a breeder repeatedly crosses hybrid progeny back to one of the parents, for example, a first generation hybrid F₁ with one of the parental genotypes of the F₁ hybrid.

Essentially all the physiological and morphological characteristics. A plant having essentially all the physiological and morphological characteristics means a plant having the physiological and morphological characteristics, except for the characteristics derived from the converted gene.

Quantitative Trait Loci (QTL). Quantitative trait loci (QTL) refer to genetic loci that control to some degree numerically representable traits that are usually continuously distributed.

Regeneration. Regeneration refers to the development of a plant from tissue culture.

Single Gene Converted (Conversion). Single gene converted (conversion) plant refers to plants which are developed by a plant breeding technique called backcrossing wherein essentially all of the desired morphological and physiological characteristics of a variety are recovered in addition to the single gene transferred into the variety via the backcrossing technique or via genetic engineering.

DETAILED DESCRIPTION OF THE INVENTION

Soybean cultivar 9431836328642 has superior characteristics and was developed from the cross A3134/3/A3313//A3237*4/40-3-2. F₁ and F₂ plants were advanced by a modified pedigree selection. F₃ derived F₄ plants were grown in Chile in 1996 where plants were selected. In 1996 F₃ derived F₅ plants were tested at 4 Midwest locations. In 1997 and 1998 the line was tested at 10 and 26 Midwest locations, respectively.

9431836328642 is an early maturity group III variety with very high yield potential to lines of similar maturity and has excellent agronomic characteristics, including lodging resistance. 9431836328642 is resistant to the Roundup™ herbicides and has a major gene for Phytophthora resistance, Rps1k, conferring resistance to most races of Phytophthora Root Rot. 9431836328642 is well adapted to the mid maturity group Ill growing areas of Iowa, Illinois, Missouri, Indiana, Nebraska and Kansas.

Some of the criteria used to select in various generations include: seed yield, lodging resistance, emergence, disease tolerance, maturity, late season plant intactness, plant height and shattering resistance.

The cultivar has shown uniformity and stability, as described in the following variety description information. It has been self-pollinated a sufficient number of generations with careful attention to uniformity of plant type. The line has been increased with continued observation for uniformity.

Soybean cultivar 9431836328642 has the following morphologic and other characteristics (based primarily on data collected at Stonington, Ill.).

VARIETY DESCRIPTION INFORMATION

1. Seed Shape: Spherical Flattened (L/W ratio>1.2; L/T ratio=<1.2)

2. Hilum Color: (Mature Seed)-Black

3. Pod color: Tan

4. Seed Coat Color: Yellow

5. Flower Color: Purple

6. Leaflet Shape: Ovate

7. Leaflet Size: Medium

8. Leaf Color: Medium-green

9. Plant Pubescence Color Tan

10. Plant Habit: Indeterminate

11. Maturity Group: III

12. Plant Lodging Score: 1.8

13. Plant Height: 39 inches

14. Physiological Responses:

Roundup Ready™ Herbicide: Resistant

15. Disease Resistance:

Phytophthora Rot (Phytophthora megasperma var. sojae)

Race 1 Resistant Race 2 Resistant Race 3 Resistant Race 4 Resistant Race 5 Resistant Race 6 Resistant Race 7 Resistant Race 8 Resistant Race 9 Resistant Race 10 Resistant Race 11 Resistant Race 13 Resistant Race 14 Resistant Race 15 Resistant Race 17 Resistant Race 18 Resistant Race 22 Resistant Race 24 Resistant

This invention is also directed to methods for producing a soybean plant by crossing a first parent soybean plant with a second parent soybean plant, wherein the first or second soybean plant is the soybean plant from the line 9431836328642. Further, both first and second parent soybean plants may be from the cultivar 9431836328642. Therefore, any methods using the cultivar 9431836328642 are part of this invention: selfing, backcrosses, hybrid breeding, and crosses to populations. Any plants produced using cultivar 9431836328642 as a parent are within the scope of this invention.

As used herein, the term “plant” includes plant cells, plant protoplasts, plant cells of tissue culture from which soybean plants can be regenerated, plant calli, plant clumps, and plant cells that are intact in plants or parts of plants, such as pollen, flowers, embryos, ovules, seeds, pods, leaves, stems, roots, anthers and the like. Thus, another aspect of this invention is to provide for cells which upon growth and differentiation produce a cultivar having essentially all of the physiological and morphological characteristics of 9431836328642.

Culture for expressing desired structural genes and cultured cells are known in the art. Also as known in the art, soybeans are transformable and regenerable such that whole plants containing and expressing desired genes under regulatory control may be obtained. General descriptions of plant expression vectors and reporter genes and transformation protocols can be found in Gruber, et al., “Vectors for Plant Transformation, in Methods in Plant Molecular Biology & Biotechnology” in Glich, et al., (Eds. pp. 89-119, CRC Press, 1993). Moreover GUS expression vectors and GUS gene cassettes are available from Clone Tech Laboratories, Inc., Palo Alto, Calif. while luciferase expression vectors and luciferase gene cassettes are available from Pro Mega Corp. (Madison, Wis.). General methods of culturing plant tissues are provided for example by Maki, et al., “Procedures for Introducing Foreign DNA into Plants” in Methods in Plant Molecular Biology & Biotechnology, Glich, et al., (Eds. pp. 67-88 CRC Press, 1993); and by Phillips, et al., “Cell-Tissue Culture and In-Vitro Manipulation” in Corn & Corn Improvement, 3rd Edition; Sprague, et al., (Eds. pp. 345-387) American Society of Agronomy Inc., 1988. Methods of introducing expression vectors into plant tissue include the direct infection or co-cultivation of plant cells with Agrobacterium tumefaciens, Horsch et al., Science, 227:1229 (1985). Descriptions of Agrobacterium vectors systems and methods for Agrobacterium-mediated gene transfer provided by Gruber, et al., supra.

Useful methods include but are not limited to expression vectors introduced into plant tissues using a direct gene transfer method such as microprojectile-mediated delivery, DNA injection, electroporation and the like. More preferably expression vectors are introduced into plant tissues using the microprojectile media delivery with the biolistic device Agrobacterium-medicated transformation. Transformant plants obtained with the protoplasm of the invention are intended to be within the scope of this invention.

The present invention contemplates a soybean plant regenerated from a tissue culture of a variety (e.g., 9431836328642) or hybrid plant of the present invention. As is well known in the art, tissue culture of soybean can be used for the in vitro regeneration of a soybean plant. Tissue culture of various tissues of soybeans and regeneration of plants therefrom is well known and widely published. For example, reference may be had to Komatsuda, T., et al., “Genotype X Sucrose Interactions for Somatic Embryogenesis in Soybean,” Crop Sci. 31:333-337 (1991); Stephens, P. A., et al., “Agronomic Evaluation of Tissue-Culture-Derived Soybean Plants,” Theor. AppI. Genet. (1991) 82:633-635; Komatsuda, T., et al., “Maturation and Germination of Somatic Embryos as Affected by Sucrose and Plant Growth Regulators in Soybeans Glycine gracilis Skvortz and Glycine max (L.) Merr.,” Plant Cell, Tissue and Organ Culture, 28:103-113 (1992); Dhir, S., et al., “Regeneration of Fertile Plants from Protoplasts of Soybean (Glycine max L. Merr.): Genotypic Differences in Culture Response,” Plant Cell Reports (1992) 11:285-289; Pandey, P. et al., “Plant Regeneration from Leaf and Hypocotyl Explants of Glycine wightii (W. And A.) VERDC. var longicauda,” Japan J. Breed. 42:1-5 (1992); and Shetty, K., et al., “Stimulation of In Vitro Shoot Organogenesis in Glycine max (Merrill.) by Allantoin and Amides,” Plant Science (1992) 81:245-251; as well as U. S. Pat. No. 5,024,944, issued Jun. 18, 1991 to Collins, et al., and U. S. Pat. No. 5,008,200, issued Apr. 16, 1991 to Rauch, et al., the disclosures of which are hereby incorporated herein in their entirety by reference. Thus, another aspect of this invention is to provide cells which upon growth and differentiation produce soybean plants having the physiological and morphological characteristics of variety 9431836328642.

The cultivar 9431836328642 is similar to AG3301. While similar to AG3301, there are numerous differences including: 9431836328642 has a black hilum and AG3301 is imperfect black. The cultivar 9431836328642 has tan pubescence while AG3301 has grey. Also, 9431836328642 has the Rps¹k gene for Phytophthora Root Rot resistance whilei AG3301 carries the Rps¹c gene.

TABLES

In Tables 1, 2 and 3 that follow, the traits and characteristics of soybean cultivar 9431836328642 are compared to several competing varieties of commercial soybeans of similar maturity. In the tables, column 1 shows the yield in bushels/acre for the instant invention and the Competitor Variety. Column 2 indicates the days to maturity after September 1 for the instant invention and the Competitor Variety. Column 3 shows the plant height in inches for the instant invention and the Competitor Variety. Column 4 indicates the plant lodging for the instant invention and the Competitor Variety. Column 5 shows the general appearance rating scores for the instant invention and the Competitor Variety. Lodging and General Appearance Rating scores are rated 1=Best and 5=Worst.

TABLE 1 1996 AGRONOMIC DATA BU/A MAT HGT LDG GR Overall Mean 55.95 33.00 34.10 1.60 2.10 Number of Locations 4 4 4 4 4 9431836328642 61.00 32.80 33.50 2.00 2.50 Asgrow A3244 65.32 33.00 33.30 1.10 1.00 Asgrow A3134 60.86 33.80 32.80 1.50 2.00 Asgrow AG2901 59.85 31.00 38.80 1.80 2.00 Asgrow A2722 49.74 31.00 31.30 1.10 2.00

TABLE 2 1997 AGRONOMIC DATA BU/A MAT HGT LDG GR Overall Mean 56.30 27.80 34.50 1.40 2.00 Number of Locations 10 10 10 9 10 LSD 2.64 0.88 1.41 0.17 0.35 9431836328642 59.45 26.20 34.50 1.60 2.40 Asgrow A3244 59.85 26.40 33.00 1.10 1.50 Asgrow A3559 59.66 30.10 34.70 1.20 1.90 Asgrow AG3002 56.80 25.00 33.70 1.80 2.50 Asgrow A2833 56.13 21.90 29.00 1.00 2.30 Asgrow AG3301 56.07 26.40 36.80 1.70 2.30

TABLE 3 1998 AGRONOMIC DATA BU/A MAT HGT LDG GR Overall Mean 61.76 21.50 37.10 1.70 2.50 Number of Locations 26 24 24 25 24 LSD 1.37 0.50 0.73 0.11 0.17 9431836328642 64.63 20.20 38.50 1.80 2.80 Asgrow AG3302 65.60 21.20 37.90 1.70 2.00 BR65950RR 63.49 21.90 37.80 2.00 2.50 Asgrow AG3002 63.00 18.80 35.20 2.10 3.10 Pioneer 93B51 62.57 21.80 36.10 1.60 2.70 Asgrow AG3303 62.37 22.10 38.00 1.20 2.10 pgR3083 62.16 18.40 34.60 1.50 2.50 Pioneer 9333 61.98 19.70 34.80 1.80 2.90 Asgrow AG3301 61.71 21.50 39.80 1.90 2.60 Pioneer 93B01 61.58 16.00 32.00 1.30 2.50 Asgrow AG2902 60.99 17.50 35.60 1.50 2.20 Asgrow AG3502 60.89 25.00 40.10 1.50 2.00 Pioneer 9344 60.40 20.70 36.80 1.70 2.70 NK S30-K3RR 60.26 17.80 37.60 1.80 2.90 NK S36-U2RR 58.71 22.50 37.20 1.70 2.80 Stine 3264 58.45 21.90 37.40 1.70 2.90 Stine 3514 57.95 18.90 36.80 1.80 3.30 Dekalb CX370RR 56.69 23.00 40.20 2.40 3.30

In Table 4 that follows, the traits and characteristics of soybean cultivar 9431836328642 are compared to several competing varieties of commercial soybeans of similar maturity. Each characteristic also indicates the number of locations which comprise the figures given. In these tables, column 1 shows the Competitor Variety. In columns 2, 3, 4 and 5 show the number of sites, the yield in bushels/acre for the instant invention, the Competitor Variety identified in column 1 and the difference, respectively. Columns 6, 7 and 8 indicate the sites tested for days to maturity after August 31, for the instant invention and Competitor Variety, respectively. Columns 9, 10 and 11 show the number of sites tested for plant height in inches for the instant invention and the Competitor Variety respectively. Columns 12, 13 and 14 show the sites tested for plant lodging scores of the instant invention and Competitor Variety. Columns 15,16 and 17 show the general rating scores for the instant invention and the Competitor Variety, respectively. Lodging and General Rating scores are rated 1=Best and 5=Worst.

TABLE 4 Check Other Check Other Matu- Matu- Check Other Check Other Check Other Other Variety Yield Yield rity rity PltHt PltHt Lodge Lodge GRat2 GRat2 or Hybrid Sites Bu/A Bu/A Diff Sites >8/31 >8/31 Sites In In Sites (1-5) (1-5) Sites (1-5) (1-5) Asgrow 39 61.4 58.5 2.9 32 1.8 1.5 35 21.4 21.0 35 37.4 35.8 AG2902 Asgrow 39 61.4 58.9 2.5 32 1.8 2.1 35 21.4 22.4 35 37.4 34.2 AG3002 Asgrow 39 61.4 57.6 3.7 32 1.8 1.9 35 21.4 24.6 35 37.4 38.9 AG3301 Asgrow 39 61.4 61.8 −0.4 32 1.8 1.7 35 21.4 26.9 35 37.4 36.6 AG3302 Asgrow 39 61.4 58.6 2.8 32 1.8 1.7 35 21.4 29.7 35 37.4 38.8 AG3502 Dekalb 35 62.2 54.9 7.3 28 1.9 2.4 31 20.8 24.3 31 37.8 39.0 CX370RR Novartis 35 62.2 57.5 4.8 28 1.9 1.9 31 20.8 18.6 31 37.8 36.4 S30-K3RR Novartis 35 62.2 57.0 5.2 28 1.9 1.8 31 20.8 23.9 31 37.8 36.4 S36-U2RR Asgrow 34 61.1 59.7 1.4 28 1.9 1.3 30 20.6 23.7 30 37.9 37.5 AGC33801 Asgrow 36 61.7 60.2 1.5 30 1.9 1.4 32 21.2 22.7 32 37.8 34.1 FPG2975 Pioneer 93B01 30 63.0 58.8 4.2 25 1.9 1.4 26 19.9 15.9 26 38.4 31.4 Pioneer 93B51 30 63.0 60.1 2.9 25 1.9 1.7 26 19.9 21.7 26 38.4 35.5 Pioneer 9344 30 63.0 58.0 5.0 25 1.9 1.8 26 19.9 20.4 26 38.4 36.3 Pioneer 9333 39 61.4 58.0 3.4 32 1.8 1.7 35 21.4 20.8 35 37.4 33.4 Stine 3264 39 61.4 56.1 5.3 32 1.8 1.7 35 21.4 24.2 35 37.4 36.0 Stine 3514 30 63.0 56.1 6.9 25 1.9 2.0 26 19.9 18.6 26 38.4 36.3

When the term soybean plant is used in the context of the present invention, this also includes any single gene conversions of that variety. The term single gene converted plant as used herein refers to those soybean plants which are developed by a plant breeding technique called backcrossing wherein essentially all of the desired morphological and physiological characteristics of a variety are recovered in addition to the single gene transferred into the variety via the backcrossing technique. Backcrossing methods can be used with the present invention to improve or introduce a characteristic into the variety. The term backcrossing as used herein refers to the repeated crossing of a hybrid progeny back to the recurrent parent. The parental soybean plant which contributes the gene for the desired characteristic is termed the nonrecurrent or donor parent. This terminology refers to the fact that the nonrecurrent parent is used one time in the backcross protocol and therefore does not recur. The parental soybean plant to which the gene or genes from the nonrecurrent parent are transferred is known as the recurrent parent as it is used for several rounds in the backcrossing protocol (Poehlman & Sleper, 1994; Fehr, 1987). In a typical backcross protocol, the original variety of interest (recurrent parent) is crossed to a second variety (nonrecurrent parent) that carries the single gene of interest to be transferred. The resulting progeny from this cross are then crossed again to the recurrent parent and the process is repeated until a soybean plant is obtained wherein essentially all of the desired morphological and physiological characteristics of the recurrent parent are recovered in the converted plant, in addition to the single transferred gene from the nonrecurrent parent.

The selection of a suitable recurrent parent is an important step for a successful backcrossing procedure. The goal of a backcross protocol is to alter or substitute a single trait or characteristic in the original variety. To accomplish this, a single gene of the recurrent variety is modified or substituted with the desired gene from the nonrecurrent parent, while retaining essentially all of the rest of the desired genetic, and therefore the desired physiological and morphological, constitution of the original variety. The choice of the particular nonrecurrent parent will depend on the purpose of the backcross, one of the major purposes is to add some commercially desirable, agronomically important trait to the plant. The exact backcrossing protocol will depend on the characteristic or trait being altered to determine an appropriate testing protocol. Although backcrossing methods are simplified when the characteristic being transferred is a dominant allele, a recessive allele may also be transferred. In this instance it may be necessary to introduce a test of the progeny to determine if the desired characteristic has been successfully transferred.

Many single gene traits have been identified that are not regularly selected for in the development of a new variety but that can be improved by backcrossing techniques. Single gene traits may or may not be transgenic, examples of these traits include but are not limited to, male sterility, waxy starch, herbicide resistance, resistance for bacterial, fungal, or viral disease, insect resistance, male fertility, enhanced nutritional quality, industrial usage, yield stability and yield enhancement. These genes are generally inherited through the nucleus. Several of these single gene traits are described in U.S. Pat. Nos. 5,959,185, 5,973,234 and 5,977,445, the disclosures of which are specifically hereby incorporated by reference.

A further aspect of the invention relates to tissue culture of soybean plants designated 9431836328642. As used herein, the term “tissue culture” indicates a composition comprising isolated cells of the same or a different type or a collection of such cells organized into parts of a plant. Exemplary types of tissue cultures are protoplasts, calli, plant clumps, and plant cells that can generate tissue culture that are intact in plants or parts of plants, such as embryos, pollen, flowers, seeds, pods, leaves, stems, roots, root tips, anthers, and the like. Means for preparing and maintaining plant tissue culture are well known in the art. By way of example, a tissue culture comprising organs has been used to produce regenerated plants. (See U.S. Pat. Nos. 5,959,185; 5,973,234 and 5,977,445, the disclosures of which are incorporated herein by reference).

DEPOSIT INFORMATION

A deposit of the Asgrow Seed Company, LLC proprietary soybean cultivar 9431836328642 disclosed above and recited in the appended claims has been made with the American Type Culture Collection (ATCC), 10801 University Boulevard, Manassas, Va. 20110. The date of deposit was Aug. 3, 2001. The deposit of 2,500 seeds were taken from the same deposit maintained by Asgrow Seed Company, LLC since prior to the filing date of this application. All restrictions upon the deposit have been removed, and the deposit is intended to meet all of the requirements of 37 C.F.R. §1.801-1.809. The ATCC accession number is PTA-3596. The deposit will be maintained in the depository for a period of 30 years, or 5 years after the last request, or for the effective life of the patent, whichever is longer, and will be replaced as necessary during that period.

Although the foregoing invention has been described in some detail by way of illustration and example for purposes of clarity and understanding, it will be obvious that certain changes and modifications may be practiced within the scope of the invention, as limited only by the scope of the appended claims. 

What is claimed is:
 1. A soybean seed designated 9431836328642, a sample of said seed deposited under ATCC Accession No. PTA-3596.
 2. A soybean plant, or parts thereof, produced by growing the seed of claim
 1. 3. Pollen of the plant of claim
 2. 4. An ovule of the plant of claim
 2. 5. A soybean plant, or parts thereof, having all of the physiological and morphological characteristics of the soybean plant of claim
 2. 6. A tissue culture of regenerable cells of a soybean plant of cultivar 9431836328642, wherein the tissue culture regenerates plants having all of the morphological and physiological characteristics of the soybean plant of claim
 2. 7. The tissue culture according to claim 6, the cells being derived from a member of the group consisting of leaves, pollen, embryos, meristematic cells, roots, root tips, anthers, flowers, seeds, stems and pods.
 8. A soybean plant regenerated from the tissue culture of claim 6, having all of the morphological and physiological characteristics of the soybean plant of claim
 2. 9. A method for producing a soybean seed comprising crossing a first parent soybean plant with a second parent soybean plant and harvesting the resultant hybrid soybean seed, wherein said first parent soybean plant or said second parent soybean plant is the soybean plant of claim
 2. 10. A hybrid soybean seed produced by the method of claim
 9. 11. A hybrid soybean plant, or parts thereof, produced by growing said hybrid soybean seed of claim
 10. 12. Soybean seed produced from said hybrid soybean plant of claim
 11. 13. A method for producing a hybrid soybean seed comprising crossing the soybean plant according to claim 2 with another, different soybean plant.
 14. A hybrid soybean seed produced by the method of claim
 13. 15. A hybrid soybean plant, or parts thereof, produced by growing said hybrid soybean seed of claim
 14. 16. Soybean seed produced from said hybrid soybean plant of claim
 15. 17. A method for producing a 9431836328642-derived soybean plant, comprising: a) crossing soybean line 9431836328642, a sample of seed of said line having been deposited under ATCC accession number PTA-3596, with a second soybean plant to yield progeny soybean seed; b) growing progeny soybean seed to yield said 9431836328642-derived soybean plant.
 18. A soybean plant, or parts thereof, derived from the soybean plant, or parts thereof of claim 2 by transformation with genetic material containing one or more transgenes operably linked to one or more regulatory elements.
 19. A method for producing a soybean plant that contains in its genetic material one or more transgenes, comprising crossing the soybean plant of claim 18 with either a second plant of another soybean line, or a non-transformed soybean plant of the line 9431836328642 (ATCC Accession No. PTA-3596), so that the genetic material of the progeny that result from the cross contains the transgene(s) operably linked to a regulatory element.
 20. A soybean plant produced by the method of claim
 19. 21. A soybean plant derived from the plant of claim 5 by a single gene conversion.
 22. The soybean plant of claim 21, wherein the gene is selected from the group consisting of: a transgene, a dominant gene, and a recessive gene.
 23. The soybean plant of claim 21, wherein the gene confers a characteristic selected from the group consisting of: herbicide resistance, insect resistance, resistance to bacterial, fungal, or viral disease, male sterility, and improved nutritional quality. 